Thermally assisted magnetic recording disk drive

Abstract

A thermally assisted magnetic recording disk drive, comprises: a magnetic recording medium, on a surface of non-magnetic substrate of which are formed an under layer, a vertical magnetic recording layer, a protective layer and a lubricant layer, sequentially; a recording/reproducing head having a magnetic pole, which is configured to apply a magnetic field onto the magnetic recording medium, and a heating means, which is configured to heat an area being applied with a magnetic field by means of a near-field light; a mechanism, which is configured to rotate the magnetic recording medium; a mechanism, which is configured to position the recording/reproducing head; and a circuit, which is configured to process a recording/reproducing signal, and further comprising, a plate-like structure, which supplies a lubricant onto a surface of the magnetic recording medium and thereby having a function of cooling the surface of the magnetic recording medium.

1 . A thermally assisted magnetic recording disk drive, comprising:
 a magnetic recording medium, on a surface of non-magnetic substrate of which are formed an under layer, a vertical magnetic recording layer, a protective layer and a lubricant layer, sequentially;   a recording/reproducing head having a magnetic pole, which is configured to apply a magnetic field onto said magnetic recording medium, and a heating means, which is configured to heat an area being applied with a magnetic field by means of a near-field light;   a mechanism, which is configured to rotate said magnetic recording medium;   a mechanism, which is configured to position said recording/reproducing head; and   a circuit, which is configured to process a recording/reproducing signal, and further comprising,   a plate-like structure, which supplies a lubricant onto a surface of said magnetic recording medium and thereby having a function of cooling the surface of said magnetic recording medium.   
     
     
         2 . The thermally assisted magnetic recording disk drive, as described in the  claim 1 , wherein a plane portion of said plate-like structure has a plate having a tapered cross-section having an inclination of 3 degree or less than that with respect to an opposite surface of said magnetic recording medium, and has a fan-shaped plane, which continuously increases a surface/volume ratio thereof directing to a side of an inner periphery of said magnetic recording medium. 
     
     
         3 . The thermally assisted magnetic recording disk drive, as described in the  claim 1 , wherein said plate-like structure opposes to both surfaces of said magnetic recording medium, without contacting therewith, and is positioned in vicinity of said recording/reproducing head. 
     
     
         4 . The thermally assisted magnetic recording disk drive, as described in the  claim 1 , wherein on a surface of in an inside of said plate-like structure is applied or impregnated a fluorinated compound, which has a number average molecular weight of 2,000 or less than that and a vapor pressure of 10 −5  Pa under a circumference of 20° C. 
     
     
         5 . The thermally assisted magnetic recording disk drive, as described in the  claim 1 , wherein the lubrication film of said magnetic recording medium is constructed with at least of one (1) kind of perfluoropolyethers, which can be expressed by the following formulas; [Formula I], [Formula II], [Formula III], [Formula IV], [Formula V], [Formula VI] and [Formula VII]: 
       
         
           
           
               
               
           
         
       
     
     
         6 . The thermally assisted magnetic recording disk drive, as described in the  claim 1 , wherein thickness of the lubrication film after rinsing said magnetic recording medium by a fluorine solvent is equal to or greater than 40% of that before rinsing thereof. 
     
     
         7 . The thermally assisted magnetic recording disk drive, as described in the  claim 1 , wherein said magnetic recording medium is treated with a process of irradiating ultraviolet rays thereon having a wavelength of 300 nm or less than that.